Holiday calendar: Riyadh at night

Saudi Arabia's capital city glitters in this picture-perfect night view captured from Earth orbit last month from the International Space Station. The spread of Riyadh's city lights hints at a bustling population, which has grown from 150,000 in 1960 to 5.4 million this year. Click on over to NASA's Earth Observatory to identify landmarks such as the Riyadh Air Base, universities and the financial district.